Audio amplifier



FIG. 1 is a front perspective view of the audio amplifier;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a right side elevation view thereof;

FIG. 8 is a top plane view thereof;

FIG. 9 is a bottom plane view thereof; and,

FIG. 10 is an enlarged view of “10” of FIG. 1 thereof. 

CLAIM I claim the ornamental design for an audio amplifier, as shown and described. 